last month there was a discussion that included HF creepers.

they are on sale again this weekend for $17.99, not the best creeper in the
world, but you can't go wrong at $17.99
(they go on sale a few times each year)

Suggest you call your store to ensure creeper in stock before heading out.
http://www.harborfreight.com/oversized-low-profile-creeper-2745.html

They also have $8.49 tiny movers dolly's which can be used to roll your
engine out from under the van when doing engine swap etc.
http://www.harborfreight.com/movers-dolly-93888.html