Amazon Valuation:
$16.50 Hot Rod Creeps
$34.89 Road Kill Rally
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$51.39 Total
Compared to Amazon, $37.99 on this drop seems like a reasonable savings.
Sorta kinda deal - RKR (can be had for under 10 occasionally in clearance sales at some OLGS and is around 17 ATM) and HRC (16.50 on the a to z site). Can save a couple bucks here, with the additional wait on MD delivery for one (prime delivery from that one place), and the cost to ship from the OLGS for the other (most olgs have a threshold for free, usually around 100ish, and might ship a single game for 6ish).