Basically, I would first check the recommendations of the HPLC manufacturer. There are autosamplers with more or less "round" needles out 

Worldwide Glass Resources offers a large selection of HPLC and GC Autosampler Vials which are manufactured from Type 1 borosilicate glass - Available in 2ml 

It seems to me that there is a plastic vial with a glass insert, which, if cheeper, would be the direction to look. If you try looking for 

No HPLC/UHPLC or GC instrument has been left behind. Our vials and well plates are suitable for all vendors' instruments. All SureSTART products are 

Clear glass or polypropylene inserts for 9mm HPLC and GC autosampler vials are available in a variety of configurations with usable volumes from 160μL to 

Selecting chromatography vials for lab use is complicated because there are many Both glass and plastic vials can be either clear or amber in color.

Vials, Screw Top, Glass. Clear / Clear Insert, 300ul with Write-On Patch and fill lines, Wide Tip Fused Insert™, 9-425mm threads, 12x32mm outer dimensions.

Reusable two-compartment trays protect vials and closures while keeping matching supplies together. Clear trays to make it easy to keep track of available 

We offer a wide selection of autosampler and general-purpose vials, Our precleaned, Type 1 borosilicate clear or amber glass vials are washed in ...