Newpowa 100w monocrystalline panels are about $110 ea. on Amazon. But you will also need a charge controller, mounting kits, mc4 connectors, kill switches/breakers, fuses, tray cables, mc4 splitters, grounding straps/stake(s)/wire, batteries, AC pure sine inverter, etc... Sealed gel solar batteries can get pretty pricey depending on what you use them for but they last a long time and can store a whole lotta power for their sise. They can be mounted in any position, unlike lead acid. My 100ah (amp hour) batteries were $175 ea. and can be used down to 50% charge (or batt life is severely shortened). So two 100ah batts will run 1a x100hrs, 2a x50hrs, 100a x1hr, 200a x30min, etc... With 800w of panels and 4-6 more batts I can run a 400w-600w (or more) grow completely off grid. That'll run about $3.5k-$4.5k complete.
This is not a grid connectable system and batteries must be used to run an AC inverter. The charge controller can run a separate direct DC load but the charge controller bases the output voltage on the battery bank voltage so batts are still needed (though they can be small and inexpensive, like little 18ah or 22ah, or even 6v+6v in series to make 12v sets in a parallel batt bank).
These systems are designed by us and can be tweaked in a million ways to fit our growing needs. Whole independent systems can even be run in parallel sets to charge large batt banks. It is possible to make a home completely off-grid with enough batteries, charge controllers, and panels. While still living in a fashion most are accustomed to.