Transactions when buying coins on localbitcoins

I am still reading, but if I buy from, say localbitcoins. How do I know if the person is giving me one single transaction or multiple small ones?
Will the person advertise he selling price, but when I buy, I will be slam with high fee because of number of transaction?
Are fee already built-in in the price saw on localbitcoins?
When buying from localbitcoins, can I choose and guarantee to use fast/slow transactions and pay corresponding fee?
Individual seller on localbitcoins, their prices varies from coinmarketcap. Beside finding seller with 1000+, anything else I should watch out?
If say I want to buy 10 coins in total... if I have the money. What should be my buying strategy given localbitcoins ppl are selling in like 1 coin?