Well I'd consider a centerfire handgun inexpensive (not 'cheap,'which also implies a lack of quality) if it retails for less that USD $600.
Some quality centerfire pistols that I know are under this price threshold are:
Springfield XD series,
Springfield Mil-Spec M1911-A1,
Glock series,
Ruger P series,
CZ 75 B,
CZ 75 DAO,
CZ 75 Compact,
CZ 75 BD,
CZ 83,
CZ 100,
CZ 85 B,
CZ 85 Combat,
CZ 40,
CZ 75 B SA,
CZ P-01,
CZ 75 D PCR