Amazon offers Prime members the Little Tikes First Slide in Blue/Red for $19.99 with free shipping. (Toys"R"Us has it for the same with free in-store pickup.) That's tied with our mention from last May as the lowest price we've seen. (It's the best deal today by $6.) It features handrails and measures 18" x 23" x 39".
Update: It's now out of stock at Amazon; however, Toys"R"Us still has it for $19.99 with in-store pickup.