Around my area 45ACP caliber pistols have lost some value due to current high ammo price.
A 45ACP caliber Ultra Carry II in very good or better condition with all original box and accessory is worth about $500...if you can find a buyer. One in 40S&W is worth even less while on ein 9mm caliber would sell for about $600. Now days everybody wants 9mm pistols. Keep in mind that price of used guns vary a lot by region.