I agree that Burpee is too expensive. You can get what you need elsewhere, for far less.
Sample Seed Shop has your varieties for $1.75 ea. but only 15 seeds per packet. Its owner (Remy) is active here at the forum.
I've never ordered from
Urban Farmer but it has them for $2 ea. (25 seeds per pkt.) & shipping to OH is just $2.
Seeds N Such has them for $2.79 ea. & shipping is a flat $3. I've ordered from that co. 3 years in a row. No problems thus far.