Looking online, I can't find the XIGMATEK ACK-I7753 for less than $11. The site I found it that cheap says they "Special Order" the product. So they don't even have it in stock for shipment. Guess NewEgg is your best bet.
Indeed get the bolt through kit much better than the push pin. For an AMD system, the system is pretty good as it is. On a side not, just make sure you google it before applying the thermal compound, for best efficiency it requires a special technic unless they've upgraded their instruction set. There is good article on Hardware Canucks.