Well, it depends on what kind of sewing you do, how much you sew, what kind of machine you think would benefit you the most, and how much money you're willing to spend to get it.

Sears sells Kenmore.  Wal Mart and Target sell Singer.  For a Viking, Janome or Bernina, you'll have to go to an authorized dealer.  If you're just wanting a machine that sews only, you can find an inexpensive decent one for a few hundred that will last a long time, but probably has no bells and whistles.  The more money you pay, the more frills you get.  If you're looking to embroider as well as sew, you're looking at around $1k for an entry level machine.  Viking, Janome and Bernina are the top three manufacturers in the US, and they all make very good machines.  If you sew a lot, I would not recommend a Singer or a Kenmore.  That's just my personal opinion, though.

ETA:  Corrected Bernina instead of Brother.  I had a brain fart, sorry.

Quoted: The sewing machine that my mom gave me is a Singer.  it's mostly functional but it's rusted since we got to South Carolina and whenever I try to thread a needle it breaks after a few minutes of sewing. I'm sure it needs a good cleaning & to be oiled. As for sewing, I made a few blankets & clothes, but mostly my husbands willing to pony up the dough because he wants me to sew the name tapes on his cami's (work uniforms). Plus it'd save us money in the long run instead of having to send all of his uniforms to the tailor. I've seen the sewing machines offered at Walmart and they just don't seem to be worth what they are asking me to pay. The hubby says $150 to $200. Mostly I am looking for a places to purchase a decent quality sewing machine at a good price. Also a friend of mine is getting married and I would rather make my dress instead of buying one for $130.

The old Singers are good machines, but the new ones are crap.  Don't buy a new Singer.  If you're only wanting to spend $150-$200, I'd suggest you go to Sears and get a Kenmore.