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Check out D-stix...I don't know if they're strong enough or big enough, but they look somewhat similar to the ones you posted. Some of the plastic tinker toys looked similar too.
I have located a supplier for these. However, they are quite pricey. They would be $3.50 each plus shipping charges. If anyone is interested in these please contact me. They would be considered a special order item so I would need a deposit if you are interested prior to ordering them.