You might want to see if you can find what you want at the TE site - I just checked, and their current shipping prices (via USPS priority mail) is $4.95 for orders under $150, and $6.95 for orders of $150 or greater. I think that is pretty reasonable.
I wonder if Performance is cutting prices on stuff and then making up for it by padding the shipping costs... Just out of curiosity I just checked Performances shipping rates, listed here. Their regular shipping ranges from $5 for orders of $1 - $18, to $10.75 for orders over $150 - and that is for ground (as in slow) shipping. If I compare my last TE shipment, at $4.95 for priority mail (which got to me in 2 days) - if I'd ordered the same stuff from Performance, I would have had to pay $8 for slow shipping or $11 for 2nd day. That's quite a difference.