Hello friend, Thankyou for your question. I have to ask "have you considered Ebay?"
It is really the best way to keep cost factors simple,not invest in your own website (unless you want to) and you can buy various items (such as holiday appropriate things) reasonably at a thrift store.
My wife once bought 4 Pooh Bear vinyl placemats with the name "Sears" on them for $1. She advertised them on Ebay thinking she'd be happy as long as someone paid $5 for all plus shipping.
Imagine her surprise when she watched that auction go to $65.00 !
It turned out that those placemats were wanted by two collectors and neither would give up until the price went out of site.
There's not many places you can do a business with this type of opportunity. I have also seen her pay 25 cents for a record and get over $10 for it on Ebay.
So,you see there is a place. You need to get organized,find a way to get on Ebay and sell. If you have any questions just let me know?
Thankyou & God Bless!