Mohgasm is out of his 16mm Round Driver, Were can I buy more?

Should I wait for more to come in or is there a place were I can buy one?

Unless someone has an extra to sell you'll have to wait for him to get more in stock. AFAIK he currently only sells them through his own store. Check the FS thread for them and see if he's said when he expects more. I've bought a lot of stuff from him in the past and he's always been great at keeping things updated.