The World Trade Center memorial may encounter yet another obstacle on the road to construction - a spending cap.

Mayor Michael Bloomberg, Governor George Pataki and New Jersey Governor Jon Corzine have set the budget for the memorial at $500 million, some $10 million more than earlier estimates. It's unclear how the $500 million "spending cap" may affect design plans, but some family members of victims say price should be no object.

"This memorial is not about a dollar sign," said Monica Iken, who lost her husband on 9/11. "This memorial has to be about what happened and it should be what was promised. We were promised a world class memorial. We are given a world class failure."

Some officials have estimated the final cost of the memorial will be closer to $1 billion because of the additional support walls and extra infrastructure needed to put the tribute, called “Reflecting Absence,” underground.

While the World Trade Center Memorial Foundation has raised more than $130 million in private contributions, fundraising has been slow so far.

Meanwhile, preliminary site work on the memorial is moving forward, despite a lawsuit filed by some relatives of those killed in the 9/11 terror attacks who claim the memorial is unsafe because they claim there are too few exits to adequately evacuate people in the event of another attack.

And in Pennsylvania, a memorial honoring those killed on United Flight 93 has taken a step closer to being approved in Washington.

The memorial would be built on a 1,700-acre site near where the plane went down on September 11th. The White House is asking Congress for $5 million to buy the land. A House subcommittee approved the funding Thursday. Lawmakers are expected to ask for another $5 milllion for the project next year.