You may need to pay more for shipping if you live far from a pool company that resurfaces. This could add up to a significant amount to your total cost.
There is a lot of information online about pool-related topics, but there is a greater amount of marketing jargon than easily understood information. A good place to start when researching pool costs is porch.com and Homeadvisor.
Quartz and pebbles are common additives. Quartz is more stain-resistant than plaster; when the two are mixed together, you get an improved, durable surface that adds true sparkle to your pool water. QuartzScapes by NPT and DiamondBrite by SGM are popular quartz-plaster blends.