I would recommend
www.rondomusic.com also, since I bought two instruments, but just know you can't play them beforehand to get an idea that's what you want. There might be some quality-control issues: terrible strings, some parts are damaged. That's just a risk one takes, and it could very well happen with buying any bass at the local guitar store. Maybe around $100 to $200. My bass was $189.95 (Fretless 6-string), and a hard case $55.95.
If not there, then consider spending more than $200 for a bass at the local guitar store. Craigslist or even this forum might have less expensive used ones.
But honestly, for the most part just getting
a bass is enough. My first bass, it didn't matter
what it was, all that mattered was it was a bass. I could play it, and it sounded good enough for me. For years, I had no idea of its basic specifications, or even what strings were on it. Actually, until recently since I changed the strings myself, I finally know what they are.
Remember it's not only getting a bass. You'll probably want a practice amplifier (+$50 to $100). Consider getting a strap ($10 to $20), a cable to connect amp and bass ($10 to $20), extra strings just in case, a tuner ($20), and perhaps instruction (a teacher, books, or online).