On the parts I described I have found that ebay vendors on the pieces are about the cheapest, and since the town I live is is fairly small and a good deal drive from Springfield or KC I tend to "shop" this way many times. I purchased a Sony Amp refubrished on ebay from a Sony outlet very cheaply named Electronic Inventory Online I believe is what it was, the Sony items came refurbrished but where all in unopened original boxes with instructions?

Isimple IS75 was about $35 off ebay, on/off switch at the local tractor supply less than $10.00,
Pac LC1 off ebay less than $10,
Sony Amp off ebay seller Electronic Inventory Online $88,
Sony Speakers off ebay seller Electronic Inventory Online approx $20
There may be better quality than Sony but lI was somewhat comfortable with the name over cheap Chinese off takes. All the connecting wires came from Walmart, actually besides the ISimple I think most walmart stores carry the other items just different brands