If you're in the States, I like 'Nuts & Volts'.
I inquired about a subscription years ago. Didn't sign-up for the subscription, but
they make their money in advertising and they apparently need a strong subscription
base to keep the advertising money coming in. Just inquiring about a subscription
got me on their mailing list, and I've been getting a monthly copy for free ever since.
They have good, do-it-yourself projects in every issue.