A monthly membership at Not My Grandpa will typically cost you $29.95 a month, but not with our deal! Signup via our Not My Grandpa discount and you will pay significantly less. Purchase the monthly plan and your membership dues are cut by 67%. Instead of $29.95, you pay just $9.95/month. To pay even less, consider purchasing either the 3-month plan for $19.95 or the 12-month plan for $94.95. That is just $6.65 and $7.91 per month on average which makes the 3-month plan the best deal currently available.