I want to get a gps system that can play dvd but I don't know where to get it for a low price?

Finding one that includes a DVD Player will not be cheap but you can get one for as low as $300.00 and that is a pretty good deal. You are going to love choosing one to put into your car, these are great to have on hand, especially when you go on road trips! Here are some suggestions I have for you and if you would like anymore help, please let me know!

• Lanzar DVD Player/MP3/GPS/AM/FM:
  

Features:

• Fully Motorized 7" TFT-LCD Wide Aspect Touch Screen
• Audio CD/DVD/VCD/SVCD/DIVX (MPEG4) JPEG/MP3 Compatible
• AM/FM-MPX Radio
• 24 Station Memory
• Front panel A/V Input

• VR3 In Dash DVD Player & GPS With Monitor:
  

Features:

• GPS comes with preloaded GPS maps, voice guidance, POI database, 4" color touchscreen, Auto Day/Night Schemes, Magnetic GPS antenna, 2D or 3D maps, Manual and Smart Zoom, Parking brake safety feature, and different route options.
• AM/FM stereo has 24 station memory presets, Auto Music Search, auto seek up/down, FM stereo/mono switch, auto scan, auto antenna activator, RDS (Radio Data System) Capable, high sensitivity PLL synthesizer, and built-in noise filter
• DVD Player plays DivX/DVD/VCD on the built-in 4" LCD Monitor or use the video outputs to play on a rear monitor (not included). Auto loading DVD mechanism and electronic shock protection.
• CD player provides an auto loading CD mechanism, electric shock protection, and CD/MP3/WMA/CD-R/CD-RW playback.
• SD card and USB port plays MP3/WMA music directly from your USB flash memory drive or SD card
• ID3 tag display
• Auxiliary line audio and video inputs accepts audio and video from external CD, MP3 (such as an iPOD Video) and DVD portable players, as well as laptop computers
• Power output is 180 Watts Peak (4x45)
• Controls include volume, bass, treble, balance, and fader
• Clock function, Mute Control, Subwoofer Control, Loudness Control, and Mode Switch between DVD/NAV/Radio