A regular Dish Network or DirecTV LNBF tunes only the DBS portion of the Ku band. You need an LBNF that is designed to tune the FSS (sometimes called FTA) portion of the Ku band which is just a little lower in frequency. The output of both LNBFs are the same making it possible to use with DBS equipment. DishPro equipment is somewhat different which makes standard FSS LNBFs incompatible if you are using DishPro LNBFs and switches for your DBS channels. If you want to make a Poor Man's Superdish you will need to use all legacy equipment. Here is an EBay link to a dish that would probably do the job of pulling in the signals from 121 or 105:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3084052586&category=32848
Here is a dual LNBF that looks like it should do the job...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3084136163&category=11726
If the LNBF that you get for it has only one output then you can combine it with the output from an SW64 or SW44 into an SW21. If the FSS LNBF that you get has two outputs then you can connect it directly to an SW64. Either way apparently works fine. One of the threads I linked to in my earlier post here suggests aligning your 30" dish by first pointing it to 119 (using a standard LNBF) then moving it slightly to the right to pick up 121 (with your FSS LNBF).