You might try the Yost 900 series vises. The vises are imported, but they're welded and cast steel instead of iron which woud make repair easier if anything went wrong. My understanding is the design used to be produced in the USA by Yost. The vises are available in a black finish or a high visibility yellow finish. The vises also seem to fit directly into your price range. The specs from the Yost catalog.
All Steel Utility Vises are economically priced for various less demanding applications. The entire vise body is constructed using structural cast steel. The bar covers the continuous rolled main screw. Each vise is equipped with replaceable hardened steel serrated jaws and built-in pipe jaws. The 360 degree swivel base features two (2) lock downs.
-Made of 50,000 PSI structural cast steel (SC37)
-Replaceable Hardened Steel Serrated Top Jaws
-All Steel Vise features Full 360 Degree Swivel Base With 2 Lockdowns
-Permanent Pipe Jaws and a Large Reinforced Anvil
-No Pinch Main Screw Handle
The Black finish vises are models 904-AS, 905-AS, 906-AS, 908-AS, and 910-AS. The last number is the jaw width and openning.
The Yellow finish vises are models 904-HV-AS, 905-HV-AS, 906-HV-AS, 908-HV-AS, and 910-HV-AS.
Yost also has a sells asteel vise that is forged unlike the previous ones that use cast steel parts. They offer a few different sizes. The only one that would fit your budget is the 4" size, model FSV-4. The specs from yost for the SV series vises.
The Yost Forged Steel Vise series is the latest in the Yost line of vises. This series is constructed out of 90,000 PSI Tensile Strength (54,000 PSI Yield Strength). This line is the only forged steel vise line to come with replaceable machinist and pipe jaws. Adjustable hardened guide rails provide smooth, precise operation. The durable powder coat finish provides a professional finish that helps prevent damage from weather. The forged steel base features two lockdowns for a tight grip.
-90,000 PSI Tensile Strength (54,000 PSI Yield Strength) Forged Steel Casting (S45C)
-Black Oxide Main Handle for increased corrosion resistance
-Replaceable Black Oxide Machinist and Pipe Jaws
-Large anvil work surface
-Adjustable guide rails for smooth operation
-360° Swivel Base with two lockdowns
-Forged steel base with three mounting holes