Yes, Grin is without any form of pre-mine or ICO. So the only way to get is to mine after the mainnet launch. Cause this project is super popular now, solo miner might not get any profit.(To clarify, just my personal guessing after reading through the thread of different chatting groups of Grin.) As for the hardwares , I think you could get better answer in this telegram group @Grinfans. Hope this helps. 
Thanks man I like the project and as i can see Grin coin would make a big history in the coming years, so I decided to give it a shot mining it. Thanks for the telegram group.
U're welcome. Good luck for your mining. btw be careful to choose the exchange if you get some Grin on hand. Too many dodgy ones doing over trade washing to attract supply from miners. hmm.. I think I better to do more digging to share here
grin & beam < market alt , regret coins ? really i don't know …… the crypto future is not written and is uncertain