Help. My baby (5 weeks) will not go to sleep without very fast, vigorous rocking/bouncing! I don't mind doing it but he's getting heavy (10 lbs) and it's exhausting doing it for 45 minutes in the middle of the night.

I think in theory he would like a swing. We borrowed this swing from a friend (Ingenuity Inlighten Cradling Swing):

http://www.amazon.com/gp/product/B00FNJ7GT6/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687702&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00KHR7OUA&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0BEXD34MVPWG0DQZ8V6R

(or a version of it, anyway) and even on the fastest setting it's way too slow. Anyone have a swing that goes REALLY FAST that you would recommend? Bonus if it is not too $$$.