I use a simple Excel sheet to keep an inventory. I keep these data of each prop I buy:
- Movie / Series / Franchise
- Prop
- Original Creator of the Replica
- Date of purchase
- Price
- Price in Euro
- Paid through (PayPal, Money Transfert, traded for X)
- Place of Purchase (The RPF, COW, eBay, Webshop, etc...)
- Bought from (Nickname on forum or eBay
- Full name of seller
- E-mail of seller
I also have a color code: props I'm willing to sell are in blue. Once sold, I strikethrough the line, but keep it in the excel as reference.
I also have a "status" colum in front of each so I can see which props are ordered / paid for / delivered, etc...