Dave, you might want to try Seeds of Italy for loads of seed per pack. I've dealt with them for only four years but am impressed with their seed count. Most of their tomato seed packs are sold per gram (1.5 grams up to 3 grams if I remember correctly). There are roughly 250 to almost 400 seeds per gram of some varieties, only about 100 seeds for a few others (at 1 gram). Packs seemed to be all priced at $3.15. (1 to 3ยข per seed)
What's also great is the packs are hermetically sealed and the foil pouches are great for folding over/resealing keeping moisture out so you can easily save seeds for next year.
I'd recommend Red Pear (NOT to be confused with American Red Pear) but a huge productive and tasty tomato, and instead of offering Roma you'd have much happier customers offering San Marzano, much bigger, more flavorful, produces very well, and is not as susceptible to BER like Roma is. Same would be true for Costuluto Genovese.
And for those customers who prefer to see and hear a common tomato name sell them a Marglobe, it too is OP, an heirloom, disease tolerant, a great fresh eating or canning tomato but most folks don't realize its many qualities.
With a few good signs placed near your plants telling of their virtues I have no doubt your customers will buy them in a hearbeat.
http://www.growitalian.com/cat...
Shoe
