Where to buy roost on base?

Excuse me, could you possibly clarify what you mean by "roost" and "on base"? Are you referring to a specific cryptocurrency, a product, or some sort of service that's available on a military base? If it's a cryptocurrency or digital asset, it's worth noting that the availability of such assets for purchase may vary depending on the location and regulations in place. However, if you're looking for a general recommendation on where to purchase cryptocurrency or digital assets, there are several reputable exchanges and platforms available that offer a wide range of options. It's always important to do your own research and thoroughly vet any platform before making a purchase.