this?

I saw people recommended this before:

http://www.amazon.com/Step-Up-Down-Roller-Coaster/dp/B00005KBVD/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=39X5MZ4BE8W04&coliid=I3F61PL46MCPLI

this was also a popular one:

 http://www.amazon.com/Step2-Naturally-Playful-Folding-Slide/dp/B001639Q50/ref=pd_sim_t_2