I would be more concerned about using an escrow company owned by the seller than the actual fee. Unless you are dealing with a newly constructed property, I would question why one would allow the seller to have direct control over the escrow. Escrow is supposed to be a neutral third party who follows the mutually agreed instructions (purchase contract and associated documents) of the transaction's principals.
Generally, the listing agent and seller decide escrow in San Diego. If however, you find that the price of their company is significantly higher, than have your agent negotiate a different escrow company.
Each escrow company has their own fees, depends on the purchase price, but I would say about a $1,000 for a purchase. Best of luck, next time hire a REALTOR
Hector R. Gastelum
Realty Executives Dillon