Welsh rugby's Six Nations success is fuelling demand for CDs of classic rugby anthems by a male voice choir.
Morriston Orpheus said its rugby CD is selling in record numbers
Morriston Orpheus Choir is struggling to keep up with orders for its 1999 album of rugby favourites such as Delilah, Sospan Fach and Cwm Rhondda.
And one Powys-based on-line retailer has temporarily sold out of CDs of Gwlad Gwlad, a recording made in 1980 to mark the WRU's Centenary.
Orders have been made not just in Wales but from ex-pats across the world.
Clive Williams, spokesman for the Morriston Orpheus, said copies of its CD, Sounds of Cardiff Arms Park, were selling in record numbers.
"The sale of this particular CD has reached new heights during the Six Nations," he said.
"At a recent event in Swansea we had to call in additional supplies as our initial stock of 30 CDs sold out within a couple of hours.
"Our website has had requests from Texas and Ohio in the USA, as well as from over the border in England.
"It's been on our stock list for years but the success of the Welsh team has had a big impact on this particular recording."
He said they would also be taking a large stock of copies to the choir's 70th Anniversary Concert at Morriston's Tabernacle Chapel on the night of the Wales against Ireland game.
"Who knows what will happen when Wales take the Grand Slam on Saturday," he added.
The 1980 Gwlad Gwlad recording saw 40 Welsh male voice choirs come together at the old Arms Park in Cardiff to mark Wales Centenary Test against New Zealand.
Indira Bhurruth of Brecon-based Wales Direct said: "The CD is one of our best sellers anyway and we take orders from all over the world.
"But we have seen an upsurge in orders over the last couple of weeks and we have temporarily sold out after sending our last one off yesterday."
If Wales beat Ireland at the Millennium Stadium on Saturday it will be the first time the team has won the Grand Slam since 1978.