2-3 bucks for some jars? You can get some glass ones from a dollar store for like, well, a dollar. And if you start "antiqueing" (ie, yard sales and thrift shops) you could probably get a good collection of jars going for a whole lot cheaper.
Or go online and buy in bulk from a supply company. You'll probably find that you can get plastic bottles (who said jars have to be made of glass?) for way way cheaper.
~~Colesea