Hey, welcome.
There's a good bit you can do as far as inexpensive mods go, especially if you do the work yourself.
Interior:
Door panel inserts
Different steering wheel emblem
Change gauge color
Change climate control color
Paint center console
Aftermarket radio
Bluetooth transmitter
Upgraded speakers
Custom headliner color
Tint
New shift knob
New shift boot
Exterior:
LED/different color headlights
Front lip
Paint wheels
Muffler delete/eBay exhaust
eBay
IntakeTint tail lights
Tint
SidemarkersChange/delete emblem colors
That's what I consider cheap (~$100 or less). I'll see if I can think of more.