Some offers mentioned below are no longer available.One of the best limited-time welcome offers available is ending soon.Right now, the Chase Sapphire Preferred® Card is offering an 80,000-point welcome bonus after spending $4,000 in the first three months from account opening. This is already one of thetop travel credit cards, and the increased welcome offer makes it even more enticing. After all, 80,000 points are worth up to $1,000 on travel when you redeem through Chase Ultimate Rewards®, and potentially more when redeemed through one of Chase's transfer partners.If you're interested in taking advantage of this limited-time offer before it expires, here are the details on why this bonus is so valuable, how to qualify and how you can earn it responsibly without getting yourself into credit card debt.Chase Sapphire Preferred's increased welcome bonusThe Chase Sapphire Preferred's increased welcome bonus gives you 80,000 bonus points after spending $4,000 on purchases within the first...