For pro labs, Photoservice is the cheapest for processing only. Lozeau has the cheapest whole roll scanning. I'm poor enough I used to occasionally get uncut processing at Photoservice for $2.50/roll, then take it to Lozeau for decent $5/roll Noritsu scans. Then either of them for prints of the keepers.
Costco was the best/cheapest all-around for process+prints+CD, and they did a pretty good job. I was lost when they stopped. Wal-Mart's 1-hour service used to be just as cheap and did a decent job but their scans sucked. Not sure if they still do it, but I'd give them a gander. Look into their send away service as opposed to the 1-hour. I hear good things about it online, but I think that's always from folks in the US.
Nowadays, I tend to process my own or have Photoservice do it, then scan everything myself. Very tedious and slow, but rewarding, and I get the best quality for the money.
Maybe I could do it for you, but then I don't live on the south shore.