Costco has PRIME Sirloin tip steaks, they sell them for around $7 maybe $8. I've bought a few of these in recent months, and I REALLY like the taste and texture. The problem is the cuts are sometimes not very uniform some piece are almost triangle shaped... What I've been doing, is to grill on the side for part of the cook time...
But anyway, the other solution is just to do low temperature smoke/cooking then if you do sear at all, do it very quickly.