My research tells me that hops is another one of those plants that "the experts" all say has to be propagated from rhizomes, because the seeds supposedly don't reliably come true. However this is something that's only sort of roughly true for many of the plants it is said about, and often it depends on just exactly what you are using the plants and their produce for. It's very much the case that the hops rhizomes I've seen for sale are very expensive, not practical for bulk plantings unless one is very rich.
Having said all that, the only place I've noticed hops seed for sale is on eBay. I think I have some incoming as part of a larger order I made, because all I want is to grow some vines to shade a structure. I don't really care if I precisely reproduce one of the named brewing varieties.
Do you want hops for beer making or as a food? It has some medicinal properties.
For the first you'd better take rhizomes because there guarantied too be the variety you want.
The second use has no preference on starting material but hop shoots are mostly obtained from old rhizomes of brewer variety's.
If you want hops just as a ornamental than pic what you wish.
Hops are native where I live and are some times annoying because they intertwine with every thing.