Never heard of this before but did a search on the net and
this is what I found.

"Pick Machine. Machines are available which allow automatic attachment of metal picks to stems of fresh, dried, or artificial flowers. The machine is expensive but saves valuable time. Metal picks, from 1.25" to 4", are serrated to aid in anchoring the flower stem, and are sold in stacks. The metal edges are sharp and care should be taken to prevent injury when working with them."

Also found the site below which sells the picks and machines.

Here is a link that might be useful: Steel Picks

The old Aleene's show used to show these. It is a nice investment for someone who makes a lot of floral arrangements.

I used to be a florist and these are great but the picks are sharp.....had many cuts from them. There used to be a hand held one but it wasn't as efficient. One problem when using it is to make sure the foam is large enough for all the picks otherwise you almost finish and the foam falls apart. If you have a florist friend they might be able to order one for you or if you know of a florist going out of business you might be able to get a used one from them. I have used just the picks and bent the edges over the stem with pliers but that is time comsuming. Might be on ebay but they are heavy (for shipping) and you'd need a source for picks too.
Rosie

Michael's does sell them. I got one for Christmas from DH and DSs last year, they used a coupon at Michael's to get it. Had wanted one for a while. They are expensive, but SOOOOO much of a help if you do a lot of silk or fresh floral. Have to say it is one of my all time favorite gifts. Picture below

Here is a link that might be useful: Pick machine and picks

I use these also--i do candy bouquets for all Holidays...and YES I'll agree, I use pliers and manually bend them over stems and filler paper-VERY time consuming!
They have a sale on floral arrangement items at Michaels this week I think or will be next week...so you might want to keep your eyes open for it...
Marci