Not realy. It depends on the store. The most common would be: Honey gouramies (colisa chuna/sota) which would be the elast likely to eat guppy fry. Dwarf gouramies (colisa lalia), that are relatively good with fry but fragile. Three-spot gouramies (trichogaster trichopterus) that would devour guppy fry, grow larger and are aggressive. The come in several color morphs - blue, gold, cosby, opaline, platinum and lavender - so don't take them to be different species. And, lastly, kissing gouramies, moonlight gouramies and pearl gouramies are quite common. Moonlights get to 7" and would eat fry. Kissers would deffinately eat fry, grow to 8" (often more) and are somewhat aggressive - especialy if crowded. pearls are my favourite fish, beautiful, quite hardy and medium-sized (4-5") but they'd probably eat some guppy fry.
If you want a gourami for a small tank, honeys are the way to go. Learn the scientific name as there are many strains and they may get confused with dwarfs. The scientific name is colisa chuna or colisa sota depending on how up-to-date their sources are. Honeys are hardier than dwarfs and stay slightly smaller (up to 1.5"). They're best kept as trios (1 male, 2 females) with 5 gallons per fish. Alternatively, a single male or a group of females can work but it all depends on what size tank you have...
Which begs the question - what size tank(s) are you considering adding them to? What other fish are in there and how many of each?
BTW, if you're after pictures of the species I mentioned, look at the pinned topics, the fish index and (I must admit my favourite) the images on www.google.com .