There are other retirement plans available aside from the 403(b).  There are several types of IRAs available:

Traditional IRA - A Traditional IRA (Individual Retirement Account) is a self-sponsored retirement savings plan. Contributions to an IRA may or may not be tax-deductible depending on your adjusted gross income. >more info

Roth IRA - Contributions to a Roth IRA are not deductible and the maximum annual contribution is the lesser of 100% of compensation or $4,000. Non-working spouses may also contribute up to $4,000 to a Roth IRA. For individuals age 50+, contributions may be increased by $500. Taxpayers with joint adjusted gross income under $150,000 (under $95,000 for single taxpayers) may make full Roth IRA contributions. Contributions may be made beyond age 70½ and qualified distributions from a Roth IRA are tax-free, subject to IRS limitations. There are no required minimum distributions on Roth IRAs. >more info