It is recommended not to buy spinning bikes. Consider buying a stationary bike (exercise bike). It is safer and more practical than spinning. General [fitness equipment store] sells aerobic exercise equipment such as treadmills, elliptical machines and exercise bikes (the latter two do not need power). If you know someone in the health club, you can buy it through it. The price is very low. Spinning bikes are generally provided to the gym by the manufacturer's equipment company.