For EDC I am looking for a knife on the lines of the Rat rc-4, but cheaper, I don't need a $100 knife ($170 after postage and duties). Any advice?

not sure what you mean by "similar"- size, hilt, steel, sheath, function, so will start with generalities.

Mora make many many solid knives starting at $10.00-15.00
solid, many handles, many steels. Not a big fan of most sheaths

Cold Steel has several (such as the Finn Bear) at 12.95 with Cordura Sheath. Good brand, good reliability overall.

Columbia River Knife and Tool has a great variety under 50.00

No affiliation blah blah- but knifecenter.com has large selection, reasonable prices. Go to fixed knife section (http://www.knifecenter.com/knifecenter/index/hunt.html) and hunt-

either by brand, type, or steel type (steel or carbon)

I never said "similar". I said "on the lines of the Rat rc-4" That is a knife of equivalent size, shape, blade thickness, width and length as the RC-4. Moras are thinner and narrower than I need (I have 3 Moras). I've bought several knives from knifecenter, (last one a Gerber paraframe, which I got on Monday) but I can't find any knife that will fit the bill in their website. Thanks for the advise though.

When I have time, I look for knives on eBay. I don't have a specific model to suggest, but there are over 100,000 knives from many countries listed there right now. You are sure to find something you like, but watch the shipping charges.

Take a look at the SOG field pup or the buck vanguard.

You may want to try-smkw.com,also known as Smoky Mountain Knife Works.If you have the time to surf this site,that is,As It's Huge,to say the least! I have NO Affiliation w/ this co./site,but have been a Satisfied customer for Many yrs.!Good Luck with the Search!

It might be a bit out of your price range but the Spyderco Bill Moran drop point is a very good field knife for the money

I was going to suggest a Cold Steel Master Hunter as a cheap alternative but holy crap they got expensive. I can't tell how thick the Kershaw Bear Hunter II is, but it might be a dirt-cheap decent alternative. I can't speak personally for either of those though.

there are lots & lots of good quality 4" knives out there.
most are similar price range to the RC-4, tho...
check out Grohmann #X107SD Outdoor Knife, factory second for $36 Canadian: http://www.grohmannknives.com/pages/clearance.html
It doesn't have the flash sheath of the RC-4, is SS instead of CS, but maybe will do what you need.
No affiliation other than being a satisfied customer (I bought 4 of 'em!)

I've been looking at knives all through the week-end (lousy weather). It appears to me that the Becker BK2 would fit my bill. The blade is an inch longer which is a plus for me.
Has anyone tried this knife or heard something about its quality?