Jim,
If you are not selling your produce you can use a set of baby scales. I see them at garage sales on occasion. Next choice would to go to Ebay and do a search. If you spend the time searching on Ebay you will eventually find what you want at a price that is okay.
If you want to weigh heavier things you can get a set of grain scales. If you live in an agricultural area they show up at garage sales once in a while. I picked up a Fairbanks Morris 1000 pound set at an Amish garage sale last year for $25. It was in very good condition too.
If you are really hurting you can make a scale if you have known weight and a small teeter totter (not sure of the spelling). Put the known weight on one end and the produce you want to distribute on the other and you will have an approximate weight. Fish weighing scales will work too, the kind carried in tackle boxes.
Good luck.
Farwell