You will have no problem renting a place in Martinsburg for $900/month. You can contact an area realtor, as there are many rentals on the MLS, or check the local newspaper
journal-news.net | News, sports, jobs, community information for Martinsburg - The Journal
There are a few 3BR, 2 1/2 BA townhomes around $900/month in and around Martinsburg. If you decide to rent within the City of Martinsburg, the rent will be cheaper and you will find two bedroom apartments much cheaper than your budget.