I want a Greenback or Vintage 30 clone to add a second 12" to my Marshall combo. What are some clones and which are best to your knowledge? And if you have approximate prices, I'd appreciate it. Also, I hope to buy 4 Celestions eventually to populate a 4x12. I have heard that someone, Avatar maybe, sells four at a time at a large discount. Anyone know anything about this? Thanks you guys.