Fusing glass scraps
Many of the glass stores have scrap bins that they sell by the pound. Check your local store. Or check out eBay.
Look through your tub of things to be recycled for bottles, jars, etc. Thrift stores and garage sales are fantastic places to find inexpensive glass plaques, bottles, plates, dishes, glasses, etc. that can be used to re-create….you will probably need to do some adjustments to your firing schedule though.
Good luck and most importantly, have fun!