Hello I own a Adposting Company that specializes in online classifieds and has the capability of bulk posting. I have my own PVA's, remote boxes, unique IP for each PVA, and full logging for every single ad posted. I also retain the number for each PVA and can re verify while posting if need at no cost to you for each account.
My rates for ad postings start at 50cents per ad for large volume postings. Currently I have all ad posting functionality completed and currently rolling out a web service front end that allows the client to adjust posting times, cities, schedules, and edit the template used for bulk posts, and view logs. Along with 24/7 phone support available at no cost.