Where/How do you DCA for the low fees and strategy?

I'm trying to buy more/use more crypto in my daily life and finding myself wanting to use funds regularly in an attempt to both set up a monthly budget and stop my large crypto buys (switch from timing the market to DCA) but I don't know where to do that reliably. I have used Coinbase but the fees aren't exactly nice to my wallets.

so I'm looking for the best place to DCA into coins for the lowest fees. Both buyers fees and sending off the exchange fees. I'm US based so I'm limited by the CEXs my government will let me use. And I'm also wondering what do you all set it for DCA? Is $25 a week better than $100 a month? Do you structure your buys around your pay days or to coincide with your other bills? I've scoffed at the concept before so I really don't know what to do now that I'm seriously considering it.