There are about 3 million and 3 knives that fit that description
For years, the "standard" would have been the Buck 110 "folding Hunter" ($40.99) for a folder, or the buck 102 ($39.99) - Both are VERY nice knifes that few mention any more.
There are a stack of knives made by CRKT that would fit the bill, either fixed or folders - heck, at the price of the CRKT stuff, you could get a nice folder, AND a small fixed blade, and still be in your budget!
Heck, for that matter, one of the BEST camp knives out there is still the classic "Boy Scout" pattern
Don't take me wrong - I LIKE a lot of the modern designs, and carry one every day, but the classics are classic because they work
Your request is in a sweet spot RE knives - I think everyone makes a sub 5" folder or straight blade. Beyond that it's your choice of budget and style. I probably have 15 or 20 knives that fit your price description point sitting around the house, and have 1 4.5" straight blade that would cost well over $600 to replace ($150 for the knife, $450+, with a multi year wait for the engraving)