My relative was thinking about planting several acres of tomatoes and
therefore didn't want to spend a lot on seeds and was seeking the
cheapest source possible. Ideally if I could locate 50 or so of those
$0.10 packs normally sold in Walmart during the summer and put them
into one container for him and mailed, it would be incredibly cheap.

I understand that cheap seeds have lower germination rates. This is ok.
The idea was to take part of the seeds and plant on unused land and use
the profits for charitable purposes. Planting tomatoes would also
create temporary jobs that are sorely needed.