Company auctions plug flats with 50-250 plugs per flat. They sell a range of flowering plants from petunias to cannas, ornamental grasses, and vegetables. Shipping for the first flat is around twenty bucks but additional flats are around 7.

I've purchased from them for years and their plants are always packed well, hydrated and fresh and arrive in a couple days. Prices ordinarily range from $10-$30 per flat, some are higher, and for popular items like ornamental grass or tomatoes the auction process will elevate prices. As well as auctions, there are slightly higher priced 'buy it now' flats.

Note that for the #250 flats each plug is pretty small, about the size of a thimble, but if you are willing to baby them along you can get incredible deals. The deals are even better if you choose perennials, because for a one time investment of time and effort and a little money, you can get masses of hundreds echinacea or other flowering perennials.