EBuggy typically refers to 1/8 racing buggies running on electric vs nitro. That’s one of the most expensive classes to get into. Kits alone are typically >$600. You would still need all electronics, tires and sometimes wheels. While almost all 1/8 buggies are 4WD, it’s unusual for any car to be upgraded from 2WD to 4WD.

You didn’t mention if you were interested in racing or just bashing about, but ebuggy is typically racing. If you want something to get started in racing for the price point you mentioned, and you are willing to go down to 1/10 2WD buggy, you can get the Associated RB10 RTR for <$400. It’s based on an older version of their full team kit. There are versions with a battery and charger for about $350. It won’t be as competitive with current kit versions, but if getting started on a budget, it’s not bad. It has a rear motor mount, so it’s better suited to dirt than carpet racing. Associated just announced the new RC10 B7. The kit alone is $400 and like the e-buggies requires all electronics, wheels & tires. It wouldn’t be unusual to be about $1000 once you’ve added all the electronics. Schumacher recently released the LD3 2WD buggy and that kit can also be had for about $400. Losi also makes a kit, but it’s fairly old now and not as popular. All 3 brands also make 4WD buggies. Kits are generally about $100 more than a 2WD kit, with similar electronics costs. Xray is another brand, but much more expensive. Tekno also makes some great kits, especially in 1/8 but similar prices to those mentioned above.

If you are looking for bashing only, the options open up quite a bit for that price point. Arrma makes the typhon (1/8 4WD buggy) in both a 3S & 6S variant. While both are the same size, the 6S variant has more robust hardware to handle the higher speed the higher voltage battery means. A 3S RTR brushed version is about $250 & just needs battery & charger. A brushless version is about $330 and also needs battery & charger. The 6S RTR is about $500 and still requires battery & charger. The RB10 mentioned earlier can be a good basher and fits the price point. Other options like short course truck, monster truck and more are available as well.