The doing it all by mail plan doesn’t seem to be a sensible business model - nobody will send you stuff unless you’ve paid them for it, but you wouldn’t want to pay them until you’ve seen it’s inappropriate condition. So you’ll never get any stock.
There are strict regulations about selling second hand electrical items, and you might struggle to meet these from a financial point of view, or to the satisfaction of buyers.
“Sellers of second-hand electrical goods are responsible for ensuring the goods meet legal safety requirements and sellers may be liable to pay compensation if they sell unsafe goods, which then cause injury or damage. If the equipment you are selling complies with an acceptable standard it will normally meet safety requirements.
Distributors and retailers, including second-hand dealers and auctions, must only sell appliances that are correctly fitted with an approved plug, with sleeved neutral and live pins, and the correct fuse. Electric fires for use in the home must have a fireguard that meets British standards, or the European equivalent.
Your responsibilities
If you are in the business of selling any second-hand electrical goods, you should be aware of the following:
the goods must meet legal safety requirements
if you sell unsafe goods, and the goods cause injury or damage, you may have to pay compensation
If you are unsure whether the goods are safe, it is recommended that a competent person examines them for access to live parts, the adequacy of the insulation, and creepage and clearance distances. The items tested should be clearly identified in a report describing the test(s) carried out and the results. The tester should also label each item to show it has passed and include the date and their initials. All failed equipment should be destroyed if it cannot be safely repaired.
You should also check whether the electrical appliances are subject to a recall. The product recall section of the GOV.UK website contains links to various providers of product recall information, including recalls of electrical products.
It is good practice to advise all staff that no electrical goods are to be sold unless they have a CE mark and a dated PAT test label is attached. Keep all test reports for your own reference and for the purpose of showing to enforcement officers if requested.”
I also think that so many baby things are at the affordable or cheap end of the market that unless you are very savvy in what you buy, the margins are likely to be very narrow.