Yeah, those should work good, but make sure that they don't get too hot. Butch Tincher, who is a very skilled heli grower, made a really good guide on growing this difficult genus-https://cpn.carnivorousplants.org/artic ... 37_144.pdf
IMHO, plants that are already growing small mature pitchers are easier to get started than the ones with little immature pitchers.
Sarracenia Northwest has some larger ones for sale, California Carnivores might get them in stock, and PetFlytrap has some available but I've never ordered plants from them but the book I ordered came in good condition. It might be wise to support some of the commercial greenhouses at this time because I would guess people are spending less. If you can't find them anywhere else I have some for sale, but I'm trying to self-isolate so I don't know when I could ship them. Also, if you were just looking for pitcher plants, try Carnivero. I ordered from them and they treated me really nice. They also have a really good selection of neps. Those H. minor on Ebay are mass-produced through tissue culture, and judging by how green and clumpy they are, they're pretty fresh out of TC and are probably still addicted to humidity and are sensitive to high-light.
A fish tank would probably work, but just make sure it doesn't get too hot. I use ultrasonic humidifiers to humidify my setup. They work really well and help cool, also.