Everything I've ever needed can be found on eBay, Aliexpress, iFixit and elsewhere. That is everything from drive caddies for old expired Thinkpads, CCFL tubes for Acer and HP consumer models, inverters for the same, CPUs, random lids for machines missing those, etc. Also, keyboards for those terrible Apple models which require the equivalent of open heart surgery to replace them. You might need to get one of those bags with 120 tiny screws with it if those are not included, make sure to check.