With that price maybe Spider Farmer, Mars hydro etc. Check out that best deals threat!
I wouldn't really believe those Amazon reviews.
https://rollitup.org/t/the-best-deals-thread-post-best-deals-and-lowest-prices-links.237610/
No chance to go for 3 days in 1gal when plants are getting bigger and more thirsty. I think 3gal is safe choice. Depends of course how long u veg, lighting etc.
Why u just dont put seeds in riot cubes and let it pop inside? I think thats the point of these cubes. Seeds to cubes and in dome for couple of days, works everytime.