onlinehostdirectory.com $400 OBO
domainbrokerinabox.com $100 OBO
myinternetcontent.com $100 OBO
nameresell.com $100 OBO

Or I will sell all four as a bundle for $500 OBO

PayPal only.

Is it a websites or just domain names?

Just the domains.

what does "OBO" mean?

Jesse001, OBO stands for Or Best Offer

Adding winxhosting.com for $200 OBO

Adding it to the bundle would make the bundle $600 OBO