Others may have better ideas, but here's what I'd try:
Not sure of the particulars regarding the format or actual numbers your barcodes will represent, but if they are your own numbers to make up, use Excel to generate a list of sequential numbers.
How to quickly insert unique sequence numbers in Excel?
Choose a free online batch barcode generator like the one at Barcodez.net
Bulk Barcode Generator | Free Online Barcode
Paste your list into the generator, and get a web page populated with images of your sequential barcodes.
In your browser, choose File > Save and select whatever options necessary to save a copy of the page with images.
This will write a folder containing the barcode images. Use that as a source for an InDesign Data Merge to generate the 100 copies with sequential barcodes.
http://helpx.adobe.com/indesign/using/data-merge.html#add_image_fields_in_the_data_source_ file