it will depend on the year of the model, but the value can range from 2000 to 20000 or more. It will also depend on the mileage, vehicle history, engine, features, etc too.
I would suggest the Mazda Miata dealership site which is www.mmmiata.com, another site to try for Mazda Miata parts is www.autopartsdeal.com/Mazda/Miata/parts.html. For used parts you can try www.autoguide.net
http://www.batterymart.com/p-12v-mazda-miata-battery.html this should help
The price varies, it depends on what condition and how much mileage the car has. A brand new Mazda Miata costs around 20k, this is a brand new, never used car.
A used Mazda Miata is a quality car. If the miles on the car are fairly decent then there is no reason why it would not be better then a new cheaper car as it still looks good.
There are several used Mazda dealers in Alberta, most notably Kramer Mazda in Calgary. Additionally, Autotrader has a number of individuals selling used Mazdas.
2001-2005 Mazda Miatas required a minimum of 91 octane.
There is a great website that has many listings for used 1990 Mazda Miatas. The website is Lemonfree.com and they have several listings for the 1990 Miatas.
Standard 4 quarts can be used for an engine oil change.
I used this guide when I changed the clutch in my 97. http://www.miata.net/garage/clutch2.html
Stock is P 185/60 R14. Used to be able to get a wider profile, but they are no longer available for 14" rims.
The Mazda Miata is a relatively inexpensive roadster type sports car that is an excellent car. Used ones are inexpensive and fun to drive.
5W30. The engine in the Sportage is from Mazda, and based on the same engine used in the Miata. Use a full synthetic 5W30 with a good oil filter. There isn't as much Sportage info out there as there is Miata, so look that up if you need more info.