Just googled it and Sulit.com do them cheap..
15 results for cost of heart bypass surgery Philippines; For sale cost of heart bypass surgery at Sulit.com.ph Online Classified Ads
Jokes aside,A quick look at the Philippine heart center packages and it says...
Bypass surgery.. Single chamber..148k Dual chamber..210.000K PRIVATE.
Semi private.. Single chamber 120,328.00 Dual chamber...178,352.00k
Ward plan..Single chamber...101,224.00 Dual..155,536.00k
So cheapest case is around 1,200 Quid and most expensive 2600 Quid..(ish)
http://www.phc.gov.ph/services/treatment.php