.22 caliber Winchester single shots fall into two categories: the regular sporting rifles and the so called "Winder muskets". The latter were used for quasi military target rifles and had sights comparable to the Krag/Springfield rifles then in use. Some were fitted with wire mainsprings, rather than the flat springs mounted on the barrel.

The Winder muskets are more common, but neither one is likely to have a shootable bore, considering the fact that they predated non-corrosive primers by decades. Moreover, Winchester firing pins were located so that they fall on the portion of the rim supported by the extractor, which makes them unsuitable for development as a really accurate target rifle, as opposed to, say, Ballards, which have a good deal of accuracy potential.

$1500 US would be pretty steep for a Winchester single shot .22 lr in this country, unless it had some particular collector value. I suspect that they are far rarer in your location.