If you're putting together a new PC, Newegg.ca has a pretty good deal on a modular power supply you might be interested in. Right now, you can pick up the OCZ ModXStream Pro 500W Modular High Performance Power Supply on sale for $39.99 EARN CASH BACK after $20 rebate card and applying the promo code CEMCJHJA28 at the checkout. Rebates are a pain but the price is good especially because this is a highly rated modular unit with decent wattage .
For those of you who are unaware, modular power supplies make building a computer significantly easier as you can remove cables you don't plan on using which, ultimately, makes cable management easier and airflow better. On average, you're looking to pay around $90 for the unit so the extra savings really do help new PC builders on a budget.
Shipping is $9.99 and don't forget to use the green link above to earn Cash Back on your purchase via RedFlagDeals.com.