Wholesale & Stock Buying
This guide is about the buying side of a repair shop: how to check a supplier, what the grade names actually mean, how to run returns, and how to price so the parts margin survives.
Three routes, and you only need one of them
Take the route that matches the buying decision in front of you.
Choose the supplier
Take this route before placing a first order. The questions that matter are about consistency, returns and stock depth rather than about the price list.
Understand the grades
Take this route before standardising on a grade. The trade names do not mean the same thing everywhere, and that is where pricing mistakes come from.
Protect the margin
Take this route once you are buying regularly. Returns, DOA and pricing decide whether the parts business makes money or just moves it.
What a good trade supplier actually provides
Two things separate a supplier you keep from one you try once, and neither is the lowest unit price.
Consistency between batches
The grade name on a trade list describes a category, not a specific part. What matters over a year of buying is whether the panels in this month’s order behave like the ones in last month’s, because a shop’s warranty costs are set by variation rather than by average quality. Asking a supplier how they control batches, and whether they will tell you when the part inside a grade changes, is more useful than comparing two price lists.
A returns process that works
Every shop has DOA parts, and what matters is how quickly they are replaced and how much argument it takes. A written process, with the checks the shop runs before returning and the evidence the supplier needs, turns a disagreement into a routine. Building that process before the first problem is what keeps a thin margin from disappearing into dead stock and unrecoverable claims.
What actually decides whether parts buying is profitable — four things
Four variables, and only one of them is the unit price.
Batch consistency
Warranty costs come from variation between orders, not from average quality. Ask how the supplier controls it.
Stock depth against demand
Depth on the models you fit weekly, to-order on the rest. Everything else is cash sitting on a shelf.
What the grade name means
The same words describe different parts at different suppliers. Standardise on behaviour, not on a label.
Pricing that carries the risk
The price has to cover consumables, the occasional comeback and the time. Cheap quotes are discounts the shop did not intend to give.
Where to go from here
Buying supports everything else on the bench.
Wholesale and buying questions
The short answers, each linked to the article set behind it.
What should I check before buying parts from a new supplier?
Ask about stock depth, batch consistency, the returns window, who pays return carriage, and whether they will tell you when the part inside a grade changes. A supplier who answers those clearly is worth a small first order even at a higher unit price.
What do RJ, DD and HX mean for iPhone screens?
They are trade labels for different aftermarket panel families with different construction and behaviour. The differences show in brightness, touch feel and how they age, and the article on the topic explains which one suits which price point rather than treating them as interchangeable.
How do I handle a DOA part?
Test it before it is fitted, record what you found, and follow the supplier’s process with that evidence. Most disputes come from fitting a part and then claiming it was faulty, which is why the pre-fit check protects the shop as much as the customer.
Should I hold stock or order as I go?
Hold depth on the two or three models you repair weekly and order the rest to job. That keeps cash out of slow-moving parts while making sure the common repairs never wait for a delivery.
How do I price repairs so the parts margin survives?
Price the job against the part cost plus consumables plus the expected comeback rate, not against a competitor’s headline price. The pricing article breaks down how shops build that number without appearing expensive.
Open a trade account and see the price list
Tell us the models you repair most and the monthly volume you buy. You will get trade pricing, stock availability on those lines, and a returns process written down rather than assumed.
Open a trade account